The difference between the two words advice and advise lies in the fact that
the first is a noun; whereas the latter is a verb.
We say, for example,
-He offered me some advice on which robot to buy –noun-
-I advise you to see a doctor as soon as possible–verb-
Again, I want to draw the readers' attention to the
fact that the word "advice' is an uncountable noun, and if we want to use it as a singular noun we say 'a piece of advice
Example: Can you give me a piece of advice, please?